Olivine-type cathode for rechargeable batteries: Role of chelating agents

S. Kandhasamy; P. Singh; S. Thurgate; M. Ionescu; D. Appadoo; M. Minakshi

doi:10.1016/j.electacta.2012.05.129

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Olivine-type cathode for rechargeable batteries: Role of chelating agents

Journal article

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Olivine-type cathode for rechargeable batteries: Role of chelating agents

S. Kandhasamy, P. Singh, S. Thurgate, M. Ionescu, D. Appadoo and M. Minakshi

Electrochimica Acta, Vol.82, pp.302-308

2012

DOI: https://doi.org/10.1016/j.electacta.2012.05.129

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Abstract

Olivine (LiCo 1/3Mn 1/3Ni 1/3PO 4) powders were synthesized at 550-600°C for 6 h in air by a sol-gel method using multiple chelating agents and used as a cathode material for rechargeable batteries. Range of chelating agents like a weak organic acid (citric acid - CA), emulsifier (triethanolamine - TEA) and non-ionic surfactant (polyvinylpyrrolidone - PVP) in sol-gel wet chemical synthesis were used. The dependence of the physicochemical properties of the olivine powders such as particle size, morphology, structural bonding and crystallinity on the chelating agent was extensively investigated. Among the chelating agents used, unique cycling behavior (75 mAh/g after 25 cycles) is observed for the PVP assisted olivine. This is due to volumetric change in trapped organic layer for first few cycles. The trapped organic species in the electrode-electrolyte interface enhances the rate of lithium ion diffusion with better capacity retention. In contrast, CA and TEA showed a gradual capacity fade of 30 and 38 mAh/g respectively after multiple cycles. The combination of all the three mixed chelating agents showed an excellent electrochemical behavior of 100 mAh/g after multiple cycles and the synergistic effect of these agents are discussed.

Details

Title: Olivine-type cathode for rechargeable batteries: Role of chelating agents
Authors/Creators: S. Kandhasamy (Author/Creator) - Murdoch University
P. Singh (Author/Creator) - Murdoch University
S. Thurgate (Author/Creator) - Macquarie University
M. Ionescu (Author/Creator) - Australian Nuclear Science and Technology Organisation
D. Appadoo (Author/Creator)
M. Minakshi (Author/Creator) - Murdoch University
Publication Details: Electrochimica Acta, Vol.82, pp.302-308
Publisher: Elsevier
Identifiers: 991005540873707891
Copyright: © 2012 Elsevier Ltd.
Murdoch Affiliation: School of Chemical and Mathematical Science
Language: English
Resource Type: Journal article

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Collaboration types: Domestic collaboration
Citation topics: 2 Chemistry; 2.62 Electrochemistry; 2.62.138 Lithium-Ion Battery
Web Of Science research areas: Electrochemistry
ESI research areas: Chemistry